SP6121 データシートの表示（PDF） - Signal Processing Technologies

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SP6121

Low Voltage, Synchronous Step Down PWM Controller

Signal Processing Technologies 

®

SP6121

Low Voltage, Synchronous Step Down PWM Controller

Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters

FEATURES

■ Optimized for Single Input Voltage - 3V to 5.5V

■ High Efficiency: Greater than 95% possible

■ Accurate, 500kHz Fixed Frequency Operation

VCC 1

GND 2

SP6121

8 PDRV

7 NDRV

■ Fast Transient Response

VFB 3

8 Pin SOIC

6 ISET

■ 500µA, IQ (25µA in Shutdown)

■ Internal, 0.4 V/ms, Soft Start Circuit

COMP 4

5 ISENSE

■ Precision 1% Reference

Now Available in Lead Free Packaging

■ Resistor Programmable Output Voltage

■ Lossless Adjustable Current Limit with

■ High Side RDS(ON) Sensing

APPLICATIONS

■ Supply Bias for

- DSP

■ 0% to 100% Duty Cycle Range

- Microprocessor Core

■ High Side PMOS Switch Negates Need for - I/O & Logic

■ External Charge Pump

■ Output Over Voltage Protection

■ Hiccup Mode Current Limit Protection

■ Video Cards

■ Board Level Supply in

Distributed Power Systems

DESCRIPTION

The SP6121 is a fixed frequency, voltage mode, synchronous PWM controller designed to work

from a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high efficiency

power conversion. The operating frequency is internally set at 500kHz, permitting the use of

small, surface mount inductors and capacitors. Requiring only few external components, the

SP6121 packaged in an 8-pin SOIC, is especially suited for low voltage applications where cost,

small size and high efficiency are critical. With its low voltage capability and inherent 100% duty

cycle operation, the SP6121 allows low dropout operation in the event of a low input supply

voltage condition.

TYPICAL APPLICATION CIRCUIT

RVCC

5

CB

3.3µF

®

VCC

PDRV

SP6121

GND U1 NDRV

VFB

ISET

RSET

2.3k

Q1

Q2

DS

3.3V

CIN

VIN

47µF

Ceramic 6.3V

1.8µH

L1

COUT

470µF x 2

1.9V 8A

VOUT

R1

5.2k

COMP

ISENSE

RZ

R2

10k

10k

CP

50pF

CZ

3.7nF

Q1 = FAIRCHILD FDS6375

Q2 = FAIRCHILD FDS6690A

DS = STMICROELECTRONICS STPS2L25BU

L1 = PANASONIC ETQ-P6F1R6SFA

COUT = SANYO 4TPB470M

Date: 5/25/04

SP6121 Low Voltage, Synchronous Step Down PWM Controller

1

© Copyright 2004 Sipex Corporation

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